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From: wmagro@roma.uiuc.edu (William Magro)
Newsgroups: comp.sys.atari.st
Subject: Re: Upgrade?
Keywords: Atari, memory
Message-ID: <1991Mar1.121834.22722@ux1.cso.uiuc.edu>
Date: 1 Mar 91 12:18:34 GMT
References: <8704@castle.ed.ac.uk>
Sender: usenet@ux1.cso.uiuc.edu (News)
Reply-To: wmagro@roma.uiuc.edu (William Magro)
Organization: University of Illinois, Urbana-Champaign
Lines: 22

In article <8704@castle.ed.ac.uk>, dam@castle.ed.ac.uk (D.MacGregor) writes:
|> 
|> I own an Atari St with a measly 520K RAM and would like to upgrade it to
|> 1040K but at the present i cant afford the slot in RAM boards that are 
|> available. So, what i was wondering is there a cheaper DIY method that i
|> can use? I had a look inside the ole ST the other day and noticed that
|> there are 4 available spaces for DRAM chips!!
|> 
|> Right, what i need to know is, has anyone out there upgraded their ST
|> themselves and if successfully could they let me know how they did it. I
|> need to know what type of chips to buy and how to go about inserting
|> them....
|> 

I took a 1040STf (revision c, with ram UNDER the power supply) and upgraded
it from 1024K to 2.5M in about 4hours for about $80.  I used two 1M SIMMs,
1 resistor and a bunch of short pieces of wire.  You can go from 512 to
1024 by just dropping in 16 more of the dram chips you already have, but
2.5M is much nicer.  Should I post a pin mapping (SIMM to motherboard)?

Memorably,
Bill Magro